Modelling Artifacts (?) when solidify modifier used

I keep on getting these weird artifacts. I think that they’re associated with normals, but, then again, what do I know. Help!

Check to see if the modifier may have been set to too low a value. It looks like it might be some intersecting geometry.

Your quads aren’t flat faces. This causes an intersection with the extruded face’s backwards normal because the solidify modifier is trying to stretch said extruded face to be flat. For a more accurate extrusion of your geometry, either use the knife tool by pressing k and cutting the bent faces to tris, or press ctrl+t to triangulate your entire mesh, which, since you’re exporting it to Unity, which triangulates the mesh anyway, won’t cause any issue, save for the fact that quads are much easier to work with.